A Study to Investigate the Efficacy and Safety of Baxdrostat in Participants With Uncontrolled Hypertension on Two or More Medications Including Participants With Resistant Hypertension

Inclusion Criteria:

* Male or female participants must be ≥ 18 years old
* Mean sitting systolic blood pressure on automated office blood pressure measurement ≥ 140 mmHg and \< 170 mmHg at Screening
* Fulfil at least 1 of the following 2 criteria:

1. uHTN subpopulation: have a stable regimen of 2 antihypertensive medications, from different therapeutic classes (at least one must be a diuretic), at maximum tolerated dose in the judgement of the Investigator
2. rHTN subpopulation: have a stable regimen of ≥ 3 antihypertensive medications, from different therapeutic classes (at least one must be a diuretic), at maximum tolerated dose in the judgement of the Investigator
* Estimated glomerular filtration rate ≥ 45 mL/min/1.73m2 at Screening
* Serum potassium (K+) level ≥ 3.5 and \< 5.0 mmol/L at Screening
* Randomisation Criterion:
* Sitting systolic blood pressure on attended automated office blood pressure measurement of ≥ 135 mmHg at the Baseline Visit

Exclusion Criteria:

* Mean sitting systolic blood pressure on attended automated office blood pressure measurement ≥ 170 mmHg
* Mean seated diastolic blood pressure on attended automated office blood pressure measurement ≥ 110 mmHg
* Serum sodium level \< 135 mmol/L at Screening
* Has the following known secondary causes of hypertension: renal artery stenosis, uncontrolled or untreated hyperthyroidism, uncontrolled or untreated hypothyroidism, pheochromocytoma, Cushing's syndrome, aortic coarctation
* New York Heart Association functional heart failure class IV at Screening
* Persistent atrial fibrillation